PHP method to connect to mysql database
This article mainly introduces the steps of connecting PHP to mysql database. It has a very good reference value. Let’s take a look at it with the editor.
Connect to the database:
Use Object-oriented method;
1. Create a mysqli object and a connection object
2. Prepare a SQL statement
3. Execute the SQL statement, if it is a query statement. Successfully return results and objects
4. Find data from the result set object;
Query attributes Code:
<?php
//造一个mysqli对象，造连接对象
$db=new MySQLi("localhost","root","12345678","heiheihei");
//括号里面填的是IP地址域名，用户名，密码，数据库的名字
//准备一条SQL语句
$sql = "select * from student";
//执行SQL语句,如果是查询语句。成功返回结果及对象
$reslut = $db->query($sql);
//判断返回是否有内容,执行成功
if($reslut)
{
//如果成功了，从结果集对象里找到数据；
$attr = $reslut->fetch_all();
//返回索引数组：$attr = $reslut->fetch_row()
//返回关联数组：tch_assoc();
//返回对象：$attr = $reslut->fetch_object();
//返回既有索引又有关联：$arrt = $reslut->fetch_array();
var_dump($attr);
?>The final return value is a set object. In order to see the results clearly, we use fetch_all(), fetch_row() ; fetch_object();
Add, delete and modify statements:
Add a piece of information:
//造连接对象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//准备SQL语句
$sql = "insert into cou values('3-111','嘿嘿','803')";
//执行SQL语句
$r = $db ->query($sql);
if($r)//如果$r是ture
{
echo "执行成功";
}
else {
echo "执行失败";
}
Change a message:
<?php
//造连接对象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//准备SQL语句
$sql = "update cou set cname='哈哈' where tno='803'";
//执行SQL语句
$r = $db ->query($sql);
if($r)
{
echo "执行成功";
}
else {
echo "执行失败";
}
?>Delete:
<?php
//造连接对象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//准备SQL语句
$sql = "delete from cou where tno='803'";
//执行SQL语句
$r = $db ->query($sql);
if($r)
{
echo "执行成功";
}
else {
echo "执行失败";
}
?>The above is the entire content of this article, I hope it will be helpful to everyone's study.
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php implements mysqlConnection Detailed explanation of pool effect steps
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